Tannins and related compounds. IV. Seven new phenol glucoside gallates from Quercus stenophylla Makino.
作者:GENICHIRO NONAKA、HIROAKI NISHIMURA、ITSUO NISHIOKA
DOI:10.1248/cpb.30.2061
日期:——
Along with gallic acid, ellagic acid, (+)-catechin and procyanidins B-1 and B-3, seven new gallates of phenol glucosides (compounds 1-7) have been isolated from the bark of Quercus stenophylla MAKINO (Fagaceae). On the basis of chemical and spectral evidence, the structures of compounds 1, 2, 4, 5 and 6 have been established respectively as 6"-O-gallate (1), 3"-O-gallate (2), 4', 6"-di-O-gallate (4), 4", 6"-di-O-gallate (5) and 3", 4", 6"-tri-O-gallate (6) of salidroside (p-hydroxyphenethyl alcohol 1-O-β-D-glucopyranoside). Similarly, compounds 3 and 7 have been characterized as 3', 4'-dihydroxyphenethyl alcohol 1-O-β-D-(6"-O-galloyl)-glucopyranoside (3) and 2, 4, 6-trimethoxyphenol 1-O-β-D-(6'-O-galloyl)-glucopyranoside (7), respectively.
从栓皮栎(Quercus stenophylla MAKINO,壳斗科)的树皮中分离出七种新的酚类葡萄糖苷鞣酸酯(化合物1-7),以及没食子酸、鞣酸、(+)-表儿茶素和原花青素B-1和B-3。根据化学和光谱证据,化合物1、2、4、5和6的结构分别确定为6"-O-鞣酸酯(1)、3"-O-鞣酸酯(2)、4', 6"-二-O-鞣酸酯(4)、4", 6"-二-O-鞣酸酯(5)和3", 4", 6"-三-O-鞣酸酯(6),它们都是salidroside(对羟基苯乙醇1-O-β-D-葡萄糖吡喃苷)。类似地,化合物3和7分别被表征为3', 4'-二羟基苯乙醇1-O-β-D-(6"-O-鞣酸酯)-葡萄糖吡喃苷(3)和2, 4, 6-三甲氧基苯酚1-O-β-D-(6'-O-鞣酸酯)-葡萄糖吡喃苷(7)。